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Related Concept Videos

Overview of Skeletal Muscle01:15

Overview of Skeletal Muscle

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Skeletal muscles are composed of a bundle of muscle fibers and are attached to bones through tendons. Each skeletal muscle fiber is a single muscle cell. The sarcolemma, the plasma membrane of a skeletal muscle cell, consists of a lipid bilayer and glycocalyx that supports muscle fibers. The sarcolemma extends into the muscle cells to form tubular structures called transverse or T-tubules. Each side of the T-tubules consists of a membrane-bound structure called the sarcoplasmic reticulum,...
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Skeletal Muscle Anatomy00:55

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Skeletal muscle is the most abundant type of muscle in the body. Tendons are the connective tissue that attaches skeletal muscle to bones. Skeletal muscles pull on tendons, which in turn pull on bones to carry out voluntary movements.
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Microscopic Anatomy of Skeletal Muscles01:13

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Skeletal muscle cells, also called muscle fibers, are distinctly elongated, multi-nucleated, slender biological units. They are packed with specialized structures designed to facilitate their primary function, which is contraction.
The muscle sarcolemma is a plasma membrane enclosing each muscle cell that conducts electrical signals called action potentials. The sarcolemma extends into the cell to form T-tubules, ensuring the neural impulses are uniformly distributed across the entire muscle...
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Motor Unit Stimulation01:20

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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
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Actin and Myosin in Muscle Contraction01:16

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Actin and myosin are contractile proteins that form the sarcomere found in skeletal muscle tissues for regulating muscle contraction. Actin, a globular contractile protein, interacts with myosin for muscle contraction. The skeletal tissue appears striped or striated under a microscope due to the repeated arrangement of contractile proteins actin and myosin along the length of myofibrils. Dark A bands and light I bands repeat along myofibrils, and the alignment of myofibrils in the cell causes...
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The Muscular System01:18

The Muscular System

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The muscular system is essential to the body's overall structure and function, playing a crucial role in movement, stability, and internal processes. It consists of three distinct types of muscle tissue: the skeletal, the smooth, and the cardiac muscles.
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Related Experiment Video

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An In Vitro Adult Mouse Muscle-nerve Preparation for Studying the Firing Properties of Muscle Afferents
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Skeletal muscle function underpins muscle spindle abundance.

Roger W P Kissane1, James P Charles1, Robert W Banks2

  • 1Department of Musculoskeletal Biology, Institute of Aging and Chronic Disease, University of Liverpool, The William Henry Duncan Building, 6 West Derby Street, Liverpool L7 8TX, UK.

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|June 1, 2022
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Muscle spindle abundance correlates with muscle fiber length, velocity, and force during walking. This variation influences whether muscles act as springs or brakes, impacting locomotion control.

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Area of Science:

  • Biomechanics
  • Neuroscience
  • Human Locomotion

Background:

  • Muscle spindle abundance varies significantly across species and individuals.
  • Previous assumptions link spindle abundance to muscle function but lack mechanistic testing.
  • Understanding this variation is crucial for comprehending motor control and muscle adaptation.

Purpose of the Study:

  • To investigate the relationship between muscle spindle abundance, muscle architecture, and in vivo muscle behavior in humans.
  • To explore the mechanistic causes and functional consequences of variation in muscle spindle density.
  • To determine how muscle spindle number relates to muscle function during locomotion.

Main Methods:

  • Integrated medical imaging techniques.
  • Subject-specific musculoskeletal modeling.
  • Analysis of in vivo muscle behavior during human walking.

Main Results:

  • Muscle spindle number strongly correlates with muscle fascicle length and its change during walking.
  • Spindle abundance is linked to muscle fiber lengthening velocity and active muscle forces.
  • Muscles with high spindle abundance function predominantly as springs, while those with low abundance act as brakes.

Conclusions:

  • Muscle fiber length, lengthening velocity, and force are key signals for central nervous system control of locomotion.
  • Muscle spindle abundance is tightly correlated with how muscles generate mechanical work.
  • These findings offer insights into the functional drivers of muscle spindle composition and motor control.